Radiation Hazard Symbol - Universal Warning Sign for Ionizing Radiation #1207251 (License: Personal Use)

This iconic black-on-yellow (or black-on-white in monochrome form) trefoil symbol consists of three stylized blades arranged symmetrically around a central circle, representing radiation emitted from an atomic nucleus. First introduced in 1946 at the University of California, Berkeley, it has since become the universal warning sign for radioactive hazards in laboratories, nuclear facilities, medical imaging centers, and transport containers. Its high-contrast design ensures immediate recognition even from a distance or under poor lighting.

Used on signage, equipment labels, packaging, and safety documentation where ionizing radiation is present; matches user intent for hazard awareness, regulatory compliance, emergency response, or educational purposes.